Tyrphanax said:

SilverWook said:

It was probably too soon for a movie to have another giant mine set.

Yeah. I actually looked into just to see if there was any reuse going on, haha. Obviously not, but still, the layout felt so similar.

I would think they would be almost a year apart production wise, and Indy's mine set was at Elstree?

It's entirely possible they had similar crews building the sets. Some set crew transitioned from The Empire Strikes Back to Flash Gordon, and the Arboria swamp looks a bit like Dagobah.